Process of manufacturing lock-nuts.



' E. R. HIBBARD.

PROCESS OF MANUFACTURING LOCK NUTS.

APPLICATION FlLED DEC.9. I914 1,253,961, Patented Apr. 16, 1.9118.

a. Egg

EDWARD R. HIBBARD, OF OAK PARK, ILLINOIS, ASSIGNOR TO GRIP NU T COMPANY,OF

- CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PROCESS OF MANUFACTURING LOCK-NUTS.

TO (M whom it may concern:

Be it known that I, EDWARD R. HIBBARD, a citizen of the United States ofAmerica,

' residing at Oak Park, in the county of Cook and State of Illinois,have invented certain new and useful Improvements in Processes ofManufacturing Lock-Nuts, of which the following is a description.

My invention belongs to that general class of devices known as gripnuts, in which a bolt nut is so constructed that it will engage thecooperating bolt in such a manner that it may not be accidentallydisengaged there from by vibration or in ordinary use. To this end myinvention consists in the novel process of manufacturing lock nutsherein shown and described, and to the process of manufacturing thesame, resulting in the production of an effective grip nut at areasonable cost.

In the drawings wherein like reference characters indicate like orcorresponding parts,

Figure 1 is a tranverse section through a grip nut embodying my improvedconstruction;

Fig. 2 is a plan View of the same, and

Fig. 3 is an edge view of the nut shown in Fig. 2.

In the preferred form shown in the drawings 1 represents a suitable nutblank, which has rolled upon the edges thereof channels 2, 2. As shown,these channels extend from about the middle line of the nut to theopposite sides thereof, and are arranged diagonally to each other. Thenut is threaded in the usual manner to engage its cooperating bolt, andis thereafter firmly held against edge movement while tools 3, 3,preferably comparatively thin, so as not to extend to the faces of thenut positioned in the line of the channels as indicated, are forcedtoward each other sufficiently to distort the bolt hole on a lineslightly diagonal and extending from one of said tools 3 toward theother. As shown, the parts are exaggerated to more clearly show theconstruction. It is obvious that but a slight change from the normal isnecessary in order to cause the nut to firmly grip or bind upon thecooperating bolt at the distorted points. As the pressure is applied inthe manner shown in the drawings, the tendency is to cause the bolt holenear the center of the nut to yield in the Patented am. is, 1918.

Application filed December 9, 1914. Serial No. 876,214.

direction of the line of least resistance and so become slightly oval inshape." While this is the preferred construction it is obvious that thenut may be similarly constructed on the other two edges to square thebolt hole at that point. lhe form illustrated in the drawings ispreferred, as stated,

although the other construction is considered within the spirit of myinvention. Nuts constructed in' this manner may be readily engaged withthe cooperating bolt at either face, but will bind upon the bolt as thenut is turned down thereon and the distorted portion of the nut reachesthe bolt threads.

If the tools 3, instead of being thin, as indicated, should be thickenough to reach substantially to the face of the nut on each side, thenthe construction, while being substantially the same at the centralportion of the nut, would be modified in the wall of the bolt holeadjacent to the tool in each case by a slight distortion. That is,whileone side of the bolt hole on each face would be substantiallynormal, owing to the increased thickness of the wall on that side, theopposite side would be slightly abnormal. Such construction, however, iscon sidered inferior to the method heretofore described, in view of thefact that it is likely to interfere to a greater or less extent withinitially threading the nut on the bolt. The same would be true, ofcourse, if the nut were transversely compressed fromthe four sidesinstead of from two.

It is obvious that if desired the channels 2, 2, or either of them, maybe omitted. In either case, however, the method is believed to beinferior. In the first instance because of the increased pressurenecessary to secure satisfactory results, owing to the increasedthickness of the walls, and consequent risk to the machinery, as well asthe uniform construction of the nut, and in the second instance becauseof the variation in the opposite side walls of the bolt hole, owing tothe fact that the material on one side was thicker and consequently morerigid than the other. In each case, how- What I claim as new and desireto secure by Letters Patent is 1. The process of formin a grip" nut,consisting in taking a threaded nut blank and compressing the same nearthe middle portion transversely to the bolt hole but slightlycliagonalthereto, to slightly distortand'ovalize the form of the bolt hole in theline of pressure.

2. The process of forming a grip nut, consisting in taking a nut blankprovided Withehannels on opposite edges ofthe nut, extendingfronrafpoint near the middle line of the nut toward the oppositefacesthereof, and screw-threading the nut in the usual manner; andthen-compressing th'e nutinear its middle "part, in line with thechannels,

and transversely to the bolt hole to slightly distort the bolt hole onthe line of pressure.

In testimony whereof, I have hereunto signed my name in the presence oftwo subscribing Witnesses.

EDWARD R. HIBBARD.

Witnesses: v

JOH W. HILL,

CinirLEs I. Conn.

some be this atmha b bbtalnedifer iijr lls each, by eddies'iiig' theCbx'hfiiisidnr 612mm,

7 Weshington, D. 6.

